Lady's slipper is a wildflower in the orchid family (Orchidaceae). Yellow lady's slipper (Cypripedium calceolus), named American valerian after Indian valerian (Valeriana wallichii), which comes from India, shares similar medical properties with pink lady's slipper. Once commonly used to treat various nervous disorders, it is a mild stimulant and is antispasmodic. Lady's slipper has been described in the folklore as a stimulant and a sedative, and no reports are currently available to confirm these opposite proposed actions. It is also often used to treat depression related to female problems. Having been almost wiped out by collectors for such medical use, it is now too rare to be used medically.

Pink lady's slipper (Cypripedium acaule) was considered a substitute for the preferred yellow lady's slipper as a medicinal plant. Used as a sedative and antispasmodic, it was substituted for the European valerian. It has also been used for male and female disorders.

Presently, there are no high quality human clinical trials available evaluating the safety and efficacy of lady's slipper. However, traditional users and some herbal experts suggest that more research may be warranted to investigate the antispasmodic and sedative/stimulant actions of lady's slipper.

These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider.

GRADE *

* Key to grades

A: Strong scientific evidence for this useB: Good scientific evidence for this useC: Unclear scientific evidence for this useD: Fair scientific evidence for this use (it may not work)F: Strong scientific evidence against this use (it likley does not work)

Tradition / Theory
The below uses are based on tradition, scientific theories, or limited research. They often have not been thoroughly tested in humans, and safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider. There may be other proposed uses that are not listed below.

There is no proven safe or effective dose of lady's slipper. Traditionally, 2-4 grams dried rhizome/root or as tea (2-4 grams dried rhizome/root steeped in 150 milliliters of boiling water for 5-10 minutes, and then strained), has been used three times daily. A liquid extract (1:1 in 45% alcohol) of 2-4 milliliters has also been used three times daily. In capsule form, one or two 570-milligram capsules of 100% lady's slipper have been taken up to three times each day with water at mealtimes.

Children (younger than 18 years):

There is no proven safe or effective dose of lady's slipper in children, and use is not recommended.

Safety
The U.S. Food and Drug Administration does not strictly regulate herbs and supplements. There is no guarantee of strength, purity or safety of products, and effects may vary. You should always read product labels. If you have a medical condition, or are taking other drugs, herbs, or supplements, you should speak with a qualified healthcare provider before starting a new therapy. Consult a healthcare provider immediately if you experience side effects.

Allergies

Avoid in individuals with a known allergy or hypersensitivity to lady's slipper. Contact with the leaves of lady's slipper may cause contact dermatitis. The stem of the showy lady's slipper, Cypripedium reginae, is covered with hairs containing a fatty acid that may cause blistering similar to that caused by poison ivy.

Side Effects and Warnings

Adverse effects of lady's slipper are not well documented in the available literature. Dermatitis (inflammation of the skin), hallucinations, and restlessness are possible side effects, although the frequency and duration of these effects are unknown. Large doses have been associated with giddiness, restlessness, headache, and mental excitement. The stem of a related species, the showy lady's slipper (Cypripedium reginae), is covered with hairs containing a fatty acid that may cause blistering similar to that caused by poison ivy, although it is unclear if other species would have the same effect.

Pregnancy and Breastfeeding

Lady's slipper is not recommended in pregnant or breastfeeding women due to a lack of available scientific evidence.

Ladies slipper contains quinines, which may have an additive effect when taken concomitantly with other quinine-containing agents, often used to treat malaria.

Lady's slipper is thought to contain tannins, glycosides, resins, and quinines. Patients taking cardiac glycosides or digoxin should use with caution.

Based on traditional use, lady's slipper may have additive effects when used with other sedatives.

Interactions with Herbs and Dietary Supplements

Lady's slipper is thought to contain tannins, glycosides, resins, and quinines. Patients taking herbs with cardiac glycoside-like effects, such as foxglove, should use with caution. Also, those taking herbs with high tannin content should also use with caution.

Lady's slipper contains quinines, which may have an additive effect with other quinine containing herbs.

Based on traditional use, lady's slipper may have additive effects when used with other sedatives. Caution is advised in patients taking herbs such as valerian or chamomile.

The information in this monograph is intended for informational purposes only, and is meant to help users better understand health concerns. Information is based on review of scientific research data, historical practice patterns, and clinical experience. This information should not be interpreted as specific medical advice. Users should consult with a qualified healthcare provider for specific questions regarding therapies, diagnosis and/or health conditions, prior to making therapeutic decisions.